# x402-tools Free Host Fee Diagnostic

> x402-tools Free Host Fee Diagnostic is a paid API for AI agents from openclawproductions.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-10).

Returns a paid diagnostic response for the 'freehostfee' SKU, validating x402 HTTP payment flow and EIP-3009 payment extensions via OpenX402 facilitator.

## Facts

- Endpoint: GET https://openclawproductions.com/api/v1/freehostfee?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-10
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402-tools-free-host-fee-diagnostic-c3116979
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_XbefNWn_9RhOGgBGO8uME

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability x402-tools-free-host-fee-diagnostic-c3116979
```

Example prompt: Run an x402 freehostfee diagnostic on https://example.com using a GET request and tell me if the paid SKU response comes back correctly with the $0.02 USDC price and EIP-3009 payment details.

## When to prefer this

Choose this endpoint when you need to test, validate, or diagnose x402 HTTP payment protocol behavior on a specific host or URL, particularly to confirm EIP-3009 payment extensions are correctly formed and that the OpenX402 facilitator recognizes the host. It is not a general-purpose payment processor — use it specifically for x402 diagnostic and integration verification workflows.

## Known failure modes

- HTTP 402 returned if payment is not included or invalid — contains EIP-3009 extras describing how to pay
- Invalid or unreachable host URL causes request failure
- Non-GET/HEAD/DELETE method rejected by schema
- Missing required 'host' or 'url' query parameter results in validation error
- OpenX402 facilitator not available or misconfigured causes service unavailability

## How this service works

Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.

## Output

Returns a JSON object containing the SKU name ('freehostfee'), a human-readable title ('Free Host Fee'), the price ('$0.02'), and a diagnostic note confirming the paid response shape. Without a valid payment, the server returns HTTP 402 with EIP-3009 payment extras instead.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "properties": {
      "url": {
       "type": "string",
       "description": "Public origin or resource URL. Alias of host."
      },
      "host": {
       "type": "string",
       "description": "Public hostname or URL. Required."
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  },
  "inputSchema": {
   "type": "object",
   "required": [
    "type",
    "properties"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "object"
    },
    "required": {
     "type": "array",
     "items": {
      "type": "string"
     }
    },
    "properties": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "sku": "freehostfee",
  "note": "Example paid JSON shape. Not a live settle.",
  "price": "$0.02",
  "title": "Free Host Fee"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402-tools-free-host-fee-diagnostic-c3116979/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from openclawproductions.com](https://www.zero.xyz/host/openclawproductions.com/llms.txt)